[petsc-users] Setting up MUMPS in PETSc

[Jed Brown]

On Tue, Oct 23, 2012 at 5:21 PM, Jinquan Zhong <jzhong at scsolutions.com>wrote:

> That is new for me.  What would you suggest, Matt?


Were you using LU or Cholesky before? That is the difference between
-pc_type lu and -pc_type cholesky. Use -pc_factor_mat_solver_package mumps
to choose MUMPS. You can access the MUMPS options with
-mat_mumps_icntl_opaquenumber.

It looks like PETSc's Clique interface does not work in parallel. (A
student was working on it recently and it seems to work in serial.) When it
is fixed to work in parallel, that is almost certainly what you should use.
Alternatively, there may well be a Fast method, depending on the structure
of the system and that fat dense block.
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